JPS6312735B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to an automatic screw tightening machine that tightens screws horizontally.The present invention relates to an automatic screw tightening machine that tightens screws in a horizontal direction. It captures the screw and moves it to tighten the screw.

A conventional example of a screw tightening machine that tightens screws in the horizontal direction will be explained with reference to FIG.

In this conventional example, the screws aligned on the chute are
The Y-pipe 81 is separated into pieces, dropped into the pipe, a few atmospheres of air is introduced into the pipe, and the screws are forced into the Y-pipe 81 in a horizontal state as shown in FIG.
A pair of jaws 82 attached to the Y pipe 81 that open and close left and right or up and down catch the screw and move the Y pipe 81 close to the tightening figure.
The screwdriver's rotation was transmitted to the bit 83, which moved it forward to tighten the screw.

The above conventional example uses a pressure pipe to force-feed the screw, but the inner diameter of this pipe is only slightly larger than the screw head diameter (if the pipe inner diameter is too large, the pipe and screw head may (Air leaks from the gap and cannot be pumped.) Therefore, the inner diameter of the pipe needs to match the head diameter, resulting in a lack of versatility.

In addition, since the Y pipe 81 has a screw feeding hole that diagonally intersects the hole through which the bit 83 passes, the screw is likely to reverse at the intersection of these two holes, and in order to stably feed the screw, the screw neck The disadvantage is that the lower length is approximately 1.5 times longer than the head diameter of the screw.

Furthermore, the supply section and the tribar section are separate units, and because they are connected by a vinyl hose for screw pressure feeding, they also have the disadvantage of requiring a large space.

A method that does not use a pressure pipe is to run screws horizontally on the chute in an almost vertical position.
The internal bit is suctioned by suction pipes located concentrically, and the screw is suctioned inside by vacuum suction.
In some cases, screws were tightened after swinging or rotating in this state and moving to a horizontal state.

However, in such cases, it is necessary to move the suction pipe and the screw tightening bit back and forth from a vertical position to a horizontal position each time a screw is tightened, which increases the overall size of the device and increases the amount of time needed to tighten one screw. It had the disadvantage that it took a lot of time.

The present invention eliminates the above-mentioned drawbacks of the conventional example,
Examples thereof will be described below based on FIGS. 1 to 13. FIG. 1 is an overall view showing one embodiment of the present invention. Reference numeral 1 denotes a hopper, into which screws are fed, and the screws scooped up by a scooping plate are sorted by a gate part 3 and sent to a pair of chute 4. and are guided by the head regulating plate 5 and aligned. Reference numeral 6 denotes a screw attitude changing unit, which supplies the screws aligned on the chute 4 and the head regulating plate 5 to the front of the suction pipe 7 while sequentially changing their attitude. Reference numeral 8 denotes a main frame, to which a cylinder 9 is fixed at the right end, and a bracket 11 to which a driver 10 is attached is connected to the piston rod of the cylinder 9. On the other hand, a pair of slide shafts 12 that slidably support the bracket 11 are fixed at both ends of the main body frame 8. driver 1
A bit 13 is fixed to the tip of the bit 13 so as to transmit the rotation of the driver 10, and a vacuum pipe 14 on the outer periphery of the bit 13 is supported by the bracket 11 and communicates with a vacuum source (not shown). . The suction pipe 7 is slidably supported and guided by a guide 15 fixed to the main body frame 8, and the vacuum pipe 14
Fixed. Further, in front of the suction pipe 7 and below the screw posture changing part 6, a catcher 17 is attached to be swingable about a pin 16 fixed to the main body frame 8 as a fulcrum, and is moved in the direction of the main body frame 8 by a tension spring 18. The stopper 19 is urged toward the body frame 8 and is in contact with a stopper 19 fixed to the main body frame 8.
A groove 20 for capturing screws is formed at the tip of the catcher 17, and the bottom 21 of the groove 20
is inclined downward in the direction of movement of the bit 13, and when the screw is captured at the bottom 21, the seventh
As shown in the figure, a screw is in contact with the end surface 22 of the L-type catcher 17 on the main frame side in a one-sided manner on the downward left side, and when the suction pipe 7 moves forward and contacts the end surface 22, the screw head is It is designed to enter the suction pipe 7 and easily suction the screw. The head holder 23 is attached to the end surface 22 of the catcher 17 so as to be adjustable in the parallel direction, and is attached in a range where the outer diameter portion of the tip of the suction pipe 7 does not come in contact with the end surface 22 of the catcher 17, so that the head holder 23 is attached to the end surface 22 of the catcher 17 so as to prevent the screw supplied from the screw attitude changing unit 6 from falling. This is to prevent Next, the screw posture changing section 6 will be explained with reference to FIGS. 2 to 5. The screw attitude changing unit 6 is fixed to the main body frame 8 by a base 25, and a central axis 26 is fixed between the base 25 and an opposing base 27. 28 is a dish-shaped outer guide plate fixed to the base 27;
A notch 32 is formed at the bottom. 29 is a dish-shaped rotating plate, and there is a groove 3 on the outer periphery that guides the shaft of the screw.
0 are molded at six locations at equal intervals, and are rotatably supported by two bearings 31 with respect to the central shaft 26. Reference numeral 33 denotes an inner guide plate, which has a notch in its upper part into which the chute fits, and is fixed to a head-regulating semicircular plate 34 for regulating the head of the screw. The head regulating semicircular plate 34 is fixed to the base 25 via a collar 35 and a member 36. Also, the base 2 of the rotating plate 29
Six pins 37 are fixed to the fifth side end face at equal intervals on the circumference at positions 30° out of phase with the groove 30, and a portion of the end protrudes from the rotary plate 29. 38 is base 2
The piston rod 39 of the air cylinder 38 has a joint 40 fixed to the tip thereof. 41 is pin 42
The claw is supported by a joint 40 between the base 25 and the head regulating semicircular plate 34 so as to be able to swing around the base 25 and the head regulating semicircular plate 34 as a fulcrum, and is biased in the direction of the head regulating semicircular plate 34 by a compression spring 43. It slides between the base 25 and the head regulating semicircular plate 34. Reference numeral 44 designates a guide block for the claw 41, which is fixed to the head-regulating semicircular plate 34 so that its position can be adjusted in a direction perpendicular to the side surface of the claw 41. Reference numeral 46 denotes a reversal prevention claw provided between the member 36 and the guide block 44 to prevent the rotating plate 29 from reversing, and it swings about a pin 47 set between the base 25 and the head regulating semicircular plate 34 as a fulcrum. It is supported and biased toward the claw 41 by a compression spring 48 .

Next, the operation will be explained. 3 to 5 show the state in which air is supplied to the cylinder 38 and the piston rod 39 is exposed. When the air supply is stopped from this state, a spring (not shown) built into the cylinder 38 causes the piston rod 39 to
draws in. At this time, the claw 41 is the piston rod 39
The R part 49 on the inside of the tip of the claw 41 hits the pin 37 shown in FIG.
4, but another pin 3 hits the anti-reversal claw 46 and the rotation does not occur, so the claw 41 resists the compression spring 43 and rotates counterclockwise in FIG. 5. The pin 37 is pushed up and placed on the left side of the pin 37 (as shown in Figure 5).
The tip of the claw 41 is brought into contact with the head regulating semicircular plate 34 by the compression spring 43. Next, when air is supplied to the cylinder 38, the piston rod 39 moves forward, but at this time, the claw tip surface 50 pushes the piston 37 clockwise (in Fig. 4), and the rotary plate 29 moves clockwise (in Fig. 4). ). At this time, the reversal prevention claw 46 is pushed by another pin 37 and swings in the direction of the arrow X in FIG. When the claw 41 moves further forward and the pin 37 rotates, the pin 37 one position behind comes into contact with the inner surface 51 of the claws 41, 42. In this state, when air is supplied to the cylinder 38 and air pressure is applied, the claw 41 moves to the pin 37.
, the claw 42 is pressed against the block 44 at the next pin 37, and the rotation of the rotary plate 29 is stopped. Further, the reversal prevention claw 46 is returned to its original position by a compression spring 47 after the pin 37 passes through. Further, by adjusting the block 44 in the vertical direction (in FIG. 4), the stopping position of the rotary plate 29 can be adjusted. As described above, the rotary plate 29 can be indexed in 60° increments by the reciprocating movement of the cylinder 38.

In FIG. 3, the screws 52-1 to 52-5 are pushed downward by gravity by the pair of inclined chute 4, and the screw 52-1 is on the rotary plate 29 located on the extension of the chute 4. The shaft portion is guided by the groove 30 and is caught in a hanging state by the outer circumferential surface 53 of the rotary plate 29, and in this state, the rotary plate 2
9 is rotated 60 degrees in the direction of arrow A (Fig. 2), the screw 52 at the tip is captured by the groove 30, and
The shaft portion is guided by the inner surface 54 of the outer guide plate 28 and the inner surface 54 of the inner guide plate 55, and the screw head is rotated 60 degrees while being guided by the inner circumferential surface 56 of the head regulating semicircular plate 34. do. The next screw 52 does not enter the groove 30 due to the leading screw 52 before rotation, and when the rotary plate 29 starts rotating, the rotary plate 29
It is separated from the screw 52-1 by the end face 57 of 9, and enters the next groove 30 when rotated 60 degrees. In this way, turn the screw 1 for every 60° rotation.
It is possible to rotate and move the books while separating them one by one. Further, since the rotary plate 29 and the outer guide plate 28 are dish-shaped and inclined at a predetermined angle, the hanging screw can be changed to a substantially horizontal position when rotated through 180 degrees.

Next, we will explain the part where the almost horizontal azalea is captured by the catcher and the screw is tightened. As mentioned above, a notch 32 is formed in the lower part of the outer guide plate 28, and the tip of the catcher 17 is inserted into this notch 32, and is biased by the tension spring 18 so that the tip 17a is approximately attached to the rotary plate 29. are in contact with each other. The screw 52, which is now almost horizontal, connects the shaft to the groove 3.
0 and the groove 20 of the catcher 17, it falls down and stops at the bottom 21 of the groove 20. The bottom part 21 is arranged so that the center of the head of the screw 52 coincides with the center of the suction pipe 7, and the shaft part is slanted forward and the top touches the end surface 22.
The lower portion is sloped away from the end surface 22. Further, the head holder 23 is fixed at the uppermost limit while being adjustable in the vertical direction within a range where the suction pipe 7 does not come in contact with the suction pipe 7 when it moves forward, thereby preventing the screw head from falling.
When the suction pipe 7 advances against the screw captured by the L-type catcher 17 while sucking air from its tip and comes into contact with the end surface 22, the screw head
As shown in the figure, since it is inclined, it is easily sucked into the suction pipe 7 (see FIG. 8). When the suction pipe 7 moves further forward, the catcher 17 is pushed by the suction pipe 7 against the tension spring 18 and moves to the ninth position.
In the state shown in the figure, the suction pipe 7 advances further and stops when it comes into contact with the workpiece (not shown), and the bit 13 rotated by the driver 10 resists against the compression spring (not shown) built into the driver 10. Then move forward further and tighten the screws.

As a second embodiment of the suction pipe 7, the tenth,
This will be explained based on FIG. 11.

The head holder 23 of the first embodiment is removed and a suction pipe 59 is attached in place of the suction pipe 7.The difference from the suction pipe 7 is that the head of the screw that falls from the top is attached to the tip. The point is that a notch 60 is formed so that the notch 6 can be received.
The length 61 of 0 is longer than the height of the screw head, and the notch width 6
2 is the same as the inner diameter of the suction pipe 59, and the position of the notch end surface 63 is below the lower end point 64 of the head regulating semicircular plate 34. With these configurations, the head of a screw that has fallen in a horizontal state can be directly received at the tip of the suction pipe 59, and when the screw is moved forward while sucking air from the suction pipe 59, the head of the screw falls into the notch. The suction pipe is sucked while sliding on the inner surface of the suction pipe at the bottom of the pipe 60, and thereafter, the screws are tightened in the same manner as in the first embodiment.

Next, a third embodiment of the suction pipe section will be described based on FIGS. 12 and 13. Catcher 17, head holder 23, and suction pipe 7 of the first embodiment
is removed, and a two-sided vertical wall 65 for guiding the screw 52 to the suction pipe 66 is provided at the lower part of the outer guide plate 28, and the suction pipe 66 is provided at the lower end thereof. Most of the screws, including their heads, which fall while being guided by the wall 65, are received by a U-shaped screw receiving part 67, which has a U-shaped notch at the tip of the suction pipe 66. In this state, when the suction pipe 67 moves forward while sucking air from the suction pipe 67, the screw is sucked into the suction pipe 67 from the head, and the screw can be tightened as in the second embodiment.

With the above configuration and operation, the present invention has the following effects.

Since the only part related to the screw head diameter is the suction pipe, if the screw shaft diameters are the same, you only need to replace the suction pipe, making it highly versatile.

A pair of catchers is not required and the structure is simple.

Since the screws are not force-fed, there are no parts that wear out due to collisions with the screws.

Since no Y-pipe or Y-pipe equivalent parts are used, there is no screw reversal that often occurs within the Y-pipe.

The screws lined up on the chute can be separated one by one and the screw posture can be changed at the same time.

In the case of the third embodiment, an L-shaped catcher is not required, the screw can be more directly attracted, and the structure is simple and reliable.

Since everything from the screw supply section to the driver section is compactly integrated, it is small and lightweight.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, partially cut away. Figure 2 shows A- shown in Figure 1.
Figure 3 is a cross-sectional view taken along B-B' shown in Figure 2, and Figure 4 is a view taken along C-C' shown in Figure 3. 25 is partially removed. Figure 5 shows the D shown in Figure 4.
- A sectional view at D', Fig. 6 is an enlarged top view showing the catcher section, and Fig. 7 is a cross-sectional view at E shown in Fig. 6.
8 is a sectional view showing the state in which the suction pipe has advanced to the catcher from the state shown in FIG. The figure is a top view showing the second embodiment of the suction pipe section, FIG. 11 is a sectional view taken along line F-F' shown in FIG. 10, and FIG. 12 is a sectional view showing the third embodiment of the suction pipe section. FIG. 13 is a sectional view of the main part taken along line GG' shown in FIG. 12, and FIG. 14 is a half sectional view showing a conventional example. 1...Hopper, 2...Scooping plate, 3...Gate section, 4...Chute, 5...Head regulating plate, 6...
Screw posture changing unit, 7... Suction pipe, 8... Body frame, 9... Cylinder, 10... Driver, 11... Bracket, 12... Slide shaft,
13...bit, 14...vacuum pipe, 15...
Guide, 16...Pin, 17...L type catcher, 18...Tension spring, 19...Stopper, 2
0... Groove, 21... Bottom of groove, 22... End face, 23... Head holder, 25... Base, 26...
central axis, 27... base, 28... outer guide plate,
29... Rotating plate, 30... Groove, 31... Bearing, 33... Inner guide plate, 34... Head regulating semicircle plate, 35... Collar, 36... Member, 37... Pin, 38... Air cylinder, 39... Piston rod, 40... Pin, 41... Compression spring, 4
2... claw, 43... joint, 44... guide block, 46... reverse prevention claw, 47... pin, 48... compression spring, 49... R section, 50...
Claw tip, 51... Inner surface of the claw, 52... Screw, 53... Outer peripheral surface (of the rotating plate), 54... Inner surface of the outer guide plate, 55... Inner surface of the inner guide plate,
56... Inner peripheral surface of 34, 57... End surface of rotating plate,
58... Opening (outer guide plate), 59... Suction pipe (head receiving), 60... Notch, 62... Notch width, 63... Notch end surface, 64... (34) lower end point, 65... Wall, 66... Adsorption pipe, 67
...U-shaped screw receiving part, 81 ...Y pipe, 82
...Jiyo, 83...Bits.

Claims (1)

[Claims] 1. In a screw tightening machine that tightens screws in a substantially vertical plane, there is provided an inclined chute that supports the screws in a hanging state in a line, and a chute located at the bottom of the chute and provided horizontally. a suction pipe capable of suctioning a screw at its tip; a rotatable bit disposed within the suction pipe; a driver connected to the bit; a cylinder for horizontally reciprocating the suction pipe and the bit; A screw is received from the terminal end of the chute in a hanging posture, and the L-shaped catch is capable of swinging by the forward movement of the suction pipe around a pin located on the movement path of the suction pipe and the bit by rotational movement. An automatic screw tightening machine consisting of a screw attitude changing section that supplies screws so that the screw shaft is in a substantially horizontal state, and a drive source that intermittently drives this screw attitude changing section. 2. In the screw posture changing section, a plurality of grooves extending in the radial direction and having a width slightly wider than the diameter of the shaft portion of the screw that holds the screw at equal intervals in the circumferential direction are formed, and the rotation is driven intermittently by the drive source. The plate is tilted approximately 45 degrees from the vertical axis and is rotatably supported on a central axis provided on the main body frame, and a part of this rotating plate is exposed to the end of the inclined chute, and the rotating plate is rotated. This allows the groove of the plate to take a position opposite to the end of the chute, and the longitudinal direction of the groove is substantially horizontal at the lower part of the rotary plate, so that the groove is placed in a position opposite to the reciprocating path of the bit of the driver. 2. The automatic screw tightening machine according to claim 1, wherein the rotating plate is arranged so that the screw can be tightened.